The Hobbit Clinker Riddle

Puzzle of the Day 2064 :  The Hobbit Clinker Puzzle

In “The Hobbit” by J. R. R. Tolkien, there are many riddles that Gollum & Bilbo ask each other.

One of them:

Alive without breath,
As cold as death;
Never thirsty, ever drinking,
All in mail never clinking.

What is it? 

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